EP 0808991 B1 20011024 - Tip Clearance control
Title (en)
Tip Clearance control
Title (de)
Spitzspielkontrolle für Turbomaschinen
Title (fr)
Réglage de jeu des extrémités des aubes
Publication
Application
Priority
GB 9610916 A 19960524
Abstract (en)
[origin: EP0808991A2] A tip clearance control system operated by differential air pressure has a movable shroud liner segment assembly (24) which forms the inner circumference of an annular pressure chamber (50) encircling the blades (22) of a rotary stage. High pressure air is bled into the chamber (50) from a source of HP compressor delivery air through small holes (41). The chamber (50) may be vented rapidly through an electrically controlled (86,84,82) valve (80) into the engine bypass duct. When the valve is opened pressure in the chamber (50) is dropped quickly below gas path pressure (PD) to move the shroud liner segments (24) radially outwards thereby increasing blade tip clearance.
IPC 1-7
IPC 8 full level
F01D 11/22 (2006.01)
CPC (source: EP US)
F01D 11/22 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR
DOCDB simple family (publication)
EP 0808991 A2 19971126; EP 0808991 A3 19971203; EP 0808991 B1 20011024; DE 69707556 D1 20011129; DE 69707556 T2 20020425; GB 2313414 A 19971126; GB 2313414 B 20000517; GB 9610916 D0 19960731; US 5871333 A 19990216
DOCDB simple family (application)
EP 97302799 A 19970424; DE 69707556 T 19970424; GB 9610916 A 19960524; US 84802697 A 19970428